Good thing I went back to the ruins, because BUG:Can't wear Ring of Endurance. If I try, "RangeError: Maximum call stack size exceeded", even if I Clear first.
So basically, a formula that worked fine in testing calls an infinite loop now- still no idea how it worked in testing. It might take a minute, but I think I have a workaround in mind. I'll go ahead and drop a patch when I finish this fix.
EDIT: Patched! Notes are on the way.